Dust-cap.



M. C. SCHWEINERT & J. KOLCKHAUSEN.

DUST CAP. APPLICATION FILED MAR 21. 19I6.

LSOQAQL Patented Apr. 29, 1919 INVENTORS "uni ens airniir newton.

MAXIIVZILIAN CHARLES SCHWEINERT, OF WEST HOBOKEN, AND JULIUS VOLCKHAUSEN, OF WEEHAWKEN, NEW JERSEY, ASSIGNORS TO A. SCI-IRADERS SON, INCORPORATED, OF BROOKLYN, NEW YORK, A CORPORATION NEW YORK.

DUST-CAP.

Dust-Caps, of which the following is a specification.

This invention relates to dust caps for tire valves or the'l ke, and anus to provide certam improvements thereln.

The invention is particularly directed to a form of the invention the body of the cap is formed of approximately cylindrical shape and the bushing has a similar formation. 1

inter-engaging projections being provided on the bushing and cap whereby a firm and rigid connection may be made between the two. Preferably the bushing is formed with a slight taper, being narrower at its outer end. and the cap body is swaged or spun down to engage suchtapered portion, whereby any relative longitudinal movement is prevented. The invention also includes certain other features of improvement which will be hereinafter more fully described.

Referring to the drawings,--

Figure 1 is an elevation of the preferred form of cap.,

Fig. 2 is a similar view'to Fig. 1 on an enlarged scale, the lower part. ofthe cap being shown in diametrical section,

Fig. 3 1s a cross-section ou the hue 3 ig. 4: 1s a similar section on the line 4-4.

*ig. 5 is' anelevation of the bushing.

Referring to the drawings, let A indicate. the cap as a Whole. It preferably comprises a body portion B and a bushing The body portion is usually closed at its top and open at its bottom, and constitutes the protecting inclosure for the valve easing. Such caps are usually constructed of brass largely for the reason that the screw-threaded por- "tion of the cap is apt to rust if constructed Specification of Letters Patent.

. llatented -lpr. 29, 19119.

Application filed March 21, 1916. Serial No. 85.623.

of steel. According to the present invention the body portion may be conveniently formed of steel or other cheap metal, either galvanized. nickel-plated. or otherwise treated. to render it suitably rust-resisting, and the bushing or screw-threaded portion is preferably formed of brass. so that there will be no danger of its rusting in place on the valve casing. t ()rdinary rust-resisting coatings when applied to a steel bushing or other screw-threzuled part are found to be in effectual. since they are sllbjQCl' to wear and the coating is quickly injured. The present construction cheapens the cost of production, since only a small portion of the more expensive metal is used.

According to the present invention means are provided to secure a rigid connection between the body portion and bushing. To this end the body portion is formed with one or more recesses D (Fig. 3), while the bushing is formed with a projection or projections E. Fig. designed to enter the recesses D and prevent relative rotative movement of the parts. By reference to Figs. 1 and 2 it will be noted that the body of the cap is formed with a series of flutes o r ridges struck from the body of the metal and ex-. tending a. substantial distance along 'the present invention is particularly applicable to this construction 0. cap, since the lower parts of the flutes on the interior present the necessary recesses D which are utilized to receive the project ions E. 1

The bushing may be forced within the recesses to such an extent as to hold the bushing against longitudinal as well as rotative displacement, but we refer to so construct the parts that an additional means is provided for resisting such movements. this end the bushing is preferably tapered toward its lower end and the foot of the body portion is, pressed or spun inwardly, as best shown in Fig. 2, thereby not only preventing the longitudinal displacement of the bushing. but clamping the latter against rotative displacement. The bushing and cap body may be given other relative forms which will accomplish the result, but we prefer the tapered construction for the repice son that it is easily manufactured, and for the further reason that the foot of the cap can thereby be made smooth and free from abrupt shoulders.

While'wehave shown and described the preferred embodiment of the invention, it

Will be understood that we do not wish to be limited thereto, since various changes may be made therein without departing from the invention. It will also be understood that the invention is applicable to other devices than dust caps.

What We claim is 1. A drawn-metal dust cap for tire valves or the like, having a substantially cylincess formed by a flute or corrugation, and

the bushing having a projection cooperating with said recess to prevent relative rotation of the parts, and the cap being pressed in to overlie the bushing and prevent longitudinal separation of the bushing and cap.

3. A dust cap for tire valves or the like, having a body portion which is substantially cylindrical and having a series of flutes adapted to constitute a grasping portion, and means for securing said cap to a threaded valve casing or the like comprising a bushing also substantially cylindrical in form, said bushing being inserted in the open end of the cap, and having projections entering the recesses of said flutes, and said parts having means for preventing relative longitudinal displacement.

In witness whereof, we have hereunto signed our names in the presence of two subscribing Witnesses.

MAXIMILIAN CHARLES SCHWEINER'I. JULIUS VOLCKHAUSEN.

lVitnesses:

THOMAS F. WALLACE, GRACE GUNDERMAN. 

